Merge pull request taizilongxu#67 from qinggniq/master

taizilongxu · web-flow · commit 04c57741aaa6 · 2018-12-02T23:19:55.000+08:00
修改中序遍历中条件错误。
diff --git a/Readme.md b/Readme.md
@@ -1705,7 +1705,7 @@ class Node(object):
 #中序遍历:遍历左子树,访问当前节点,遍历右子树
 
 def mid_travelsal(root):
-    if root.left is None:
+    if root.left is not None:
         mid_travelsal(root.left)
     #访问当前节点
     print(root.value)
